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Note 8 - Goodwill and Intangible Assets - Intangible Assets and Related Accumulated Amortization (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Cost $ 972.4 $ 927.1
Accumulated amortization (464.4) (422.3)
Net $ 508.0 $ 504.8
Technology-Based Intangible Assets [Member]    
Weighted average useful life (Year) 8 years 8 years
Cost $ 369.3 $ 355.1
Accumulated amortization (245.8) (229.3)
Net $ 123.5 $ 125.8
Marketing-Related Intangible Assets [Member]    
Weighted average useful life (Year) 6 years 6 years
Cost $ 42.6 $ 41.3
Accumulated amortization (37.4) (35.5)
Net $ 5.2 $ 5.8
Contract-Based Intangible Assets [Member]    
Weighted average useful life (Year) 6 years 6 years
Cost $ 5.0 $ 5.0
Accumulated amortization (5.0) (5.0)
Net $ 0.0 $ 0.0
Customer-Related Intangible Assets [Member]    
Weighted average useful life (Year) 13 years 13 years
Cost $ 540.3 $ 510.7
Accumulated amortization (169.3) (146.7)
Net $ 371.0 $ 364.0
Database [Member]    
Weighted average useful life (Year) 8 years 8 years
Cost $ 15.2 $ 15.0
Accumulated amortization (6.9) (5.8)
Net $ 8.3 $ 9.2